Topic
Bessel beam
About: Bessel beam is a research topic. Over the lifetime, 1946 publications have been published within this topic receiving 42264 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this article, the collapse of a finite-width diffraction-free beam (FDFB) under propagation in free space is studied by using relation between the waveguide modes and the free-space modes generated by a Fresnel source of the respective finite-length waveguide.
3 citations
TL;DR: In this paper, second-harmonic generation from well-defined verticallyaligned gallium-arsenide nanowires was used to characterize the longitudinal electric field components of a focused linearly-polarized Bessel beam.
Abstract: Non-diffractive Bessel beams are receiving significant interest in optical microscopy due to their remarkably large depth of field. For example, studies have shown the superiority of Bessel beams over Gaussian beams for volumetric imaging of three-dimensionally thick or extended samples. However, the vectorial aspects of the focal fields of Bessel beams are generally obscured when traditional methods are used to characterize their three-dimensional point-spread function in space, which contains contributions from all optical field components. Here, we show experimentally the three-dimensional spatial distribution and enhanced depth of field of the longitudinal electric field components of a focused linearly-polarized Bessel beam. This is done through second-harmonic generation from well-defined vertically-aligned gallium-arsenide nanowires, whose second-order response is primarily driven by the longitudinal fields at the beam focus.
3 citations
Patent•
19 Dec 1991
TL;DR: In this article, the authors proposed a Bessel beam generation device which can change a generation position in the direction of the optical axis by converting an incident laser beam into an annular light beam.
Abstract: PURPOSE: To provide a Bessel beam generation device which can change a generation position in the direction of the optical axis CONSTITUTION: This optical device consists of an optical means which consists of a 1st concentric interference fringe hologram 2 and a 2nd hologram 3 and converts an incident laser beam 1 into an annular light beam and a 3rd hologram 4 which is irradiated with the annular light beam 1; and at least one of the 1st and 2nd holograms is shift in the optical axis direction to change the Bessel beam generation position in the optical axis direction COPYRIGHT: (C)1993,JPO&Japio
3 citations
Patent•
24 Feb 2016TL;DR: In this paper, the authors provided an imaging device including a Bessel beam generator configured to provide a bessel beam; a scanning mirror configured to scan the Bessel beams across a two-dimensional plane; a scan lens configured to receive the bessel beams from the scanning mirror, a centre of the scan lens being at least substantially a focal length of the scanning lens away from the scan mirror; and an illumination tube lens equipped with an illumination objective positioned in direct line-of-sight to a specimen, wherein a center of the illumination objective lens is at least the focal length
Abstract: According to various embodiments, there is provided an imaging device including a Bessel beam generator configured to provide a Bessel beam; a scanning mirror configured to scan the Bessel beam across a two-dimensional plane; a scan lens configured to receive the Bessel beam from the scanning mirror, a centre of the scan lens being at least substantially a focal length of the scan lens away from the scanning mirror; an illumination tube lens configured to receive the Bessel beam from the scan lens, a centre of the illumination tube lens being at least substantially a sum of the focal length of the scan lens and a focal length of the illumination tube lens away from the centre of the scan lens; an illumination objective lens positioned in direct line-of-sight to a specimen, the illumination objective lens configured to receive the Bessel beam from the illumination tube lens and further configured to illuminate the specimen with the Bessel beam, wherein a centre of the illumination objective lens is at least substantially the focal length of the illumination tube lens away from the centre of the illumination tube lens; and a detection optics arrangement configured to receive a reflected beam (emitted fluorescence beam) from the specimen.
3 citations
TL;DR: In this paper, numerical modeling of the generation and transformation of vortex Bessel beams based on scalar diffraction theory has been performed, and it was shown that the Bessel beam with diameters of the first ring of 1.7 and 3.2 mm for topological charges ±1 and ±2, respectively, can propagate at a distance up to 160 mm without dispersion.
3 citations